title: Monte Carlo study of mixed-spin S = (1/2, 1) Ising ferrimagnets.
abstract: We investigate Ising ferrimagnets on square and simple cubic lattices with exchange couplings between spins of values S = 1/2 and 1 on neighbouring sites and an additional single-site anisotropy term on the S = 1 sites. Mainly on the basis of a careful and comprehensive Monte Carlo study, we conclude that there is no tricritical point in the two-dimensional case, in contradiction to mean-field predictions and recent series results. However, evidence for a tricritical point is found in the three-dimensional case. In addition, a line of compensation points is found for the simple cubic, but not for the square lattice.
authors.affiliation: Institut für Theoretische Physik, RWTH Aachen, 52056 Aachen, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Selke
authors.forename: J
authors.initials: J
authors.lastname: Oitmaa
mesh_terms: D003198:Computer Simulation; D004574:Electromagnetic Fields; D007501:Iron / Q000737:chemistry*; D008956:Models, Chemical; D008962:Models, Theoretical; D009010:Monte Carlo Method; D009942:Organometallic Compounds / Q000737:chemistry*; D013113:Spin Labels
chemical_list: D009942:Organometallic Compounds; D013113:Spin Labels; D007501:Iron